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IEHB system main cylinder hydraulic pressure estimation method based on novel displacement pressure model

A pressure model and hydraulic pressure technology, which is applied in the field of hydraulic pressure estimation of the main cylinder of the IEHB system based on the new displacement pressure model, can solve the problems of accurate modeling that needs to be further improved, achieve typicality and versatility, and improve hydraulic pressure estimation Accuracy, the effect of improving accuracy

Active Publication Date: 2021-04-30
TONGJI UNIV
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Problems solved by technology

In summary, it is of great significance to develop the hydraulic pressure estimation of the main cylinder of the IEHB system. In addition, the core difficulty of hydraulic pressure estimation, that is, the accurate modeling of displacement pressure characteristics needs to be further improved

Method used

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  • IEHB system main cylinder hydraulic pressure estimation method based on novel displacement pressure model
  • IEHB system main cylinder hydraulic pressure estimation method based on novel displacement pressure model
  • IEHB system main cylinder hydraulic pressure estimation method based on novel displacement pressure model

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Embodiment

[0031] The present invention relates to a method for estimating the hydraulic pressure of the main cylinder of the IEHB system based on a novel displacement pressure model. The main structure of the IEHB system used in this embodiment is as follows figure 1 shown, which includes:

[0032] Brake pedal unit: including the brake pedal 12 assembly, reflecting the driver's driving intention;

[0033] Active pressure building unit: including motor (permanent magnet synchronous motor 2 in this embodiment), worm gear and rack and pinion (reduction transmission mechanism 3 in this embodiment), used to convert the rotational torque of the motor into The translational thrust of the master cylinder is pushed to generate the corresponding brake fluid pressure;

[0034] Brake execution unit: including brake master cylinder 8, brake wheel cylinder 7, solenoid valve (normally open solenoid valve 5 in this embodiment), liquid storage tank 4 and hydraulic pipelines, used to drive the gear of t...

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Abstract

The invention relates to an IEHB system main cylinder hydraulic pressure estimation method based on a novel displacement pressure model. The IEHB system main cylinder hydraulic pressure estimation method comprises the steps of 1) testing the displacement pressure characteristics of an IEHB system; 2) performing polynomial fitting on the displacement pressure characteristics of the IEHB system; 3) establishing a novel displacement pressure model based on rack speed compensation; and 4) estimating the main cylinder hydraulic pressure of the IEHB system according to the established novel displacement pressure model based on rack speed compensation. Compared with the prior art, the method has the advantages of high estimation precision, high universality and the like.

Description

technical field [0001] The invention relates to the technical field of automobile brake-by-wire, in particular to a method for estimating hydraulic pressure of a master cylinder of an IEHB system based on a novel displacement pressure model. Background technique [0002] The Integrated Electro Hydraulic Braking (IEHB) system integrates the servo electric booster device with the master cylinder. While ensuring the overall compact structure, it can quickly and accurately adjust the output through the joint hydraulic adjustment unit. brake pressure, and it is easier to integrate the above-mentioned new vehicle active safety functions. Since the IEHB system has the decoupling capability of the main and wheel cylinder hydraulic pressure and the active pressure building function, it can realize the maximum braking energy recovery of electric vehicles and the AEB (Autonomous emergency braking, automatic braking system) and ACC (Adaptive Braking System) of intelligent driving vehicl...

Claims

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Application Information

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IPC IPC(8): B60T13/74B60T17/22
CPCB60T13/745B60T13/746B60T17/22
Inventor 史彪飞熊璐余卓平
Owner TONGJI UNIV
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